Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
  • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
  • A47F3/00—Show cases or show cabinets
  • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
  • A47F3/0482—Details common to both closed and open types
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B2400/00—Component parts or details not otherwise provided for in this subclass
  • F25B2400/22—Refrigeration systems for supermarkets
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B49/00—Arrangement or mounting of control or safety devices
  • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
  • F25B49/027—Condenser control arrangements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
  • F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine

Definitions

• a procedure for controlling refrigerating machines and a system for carrying out said procedure is a procedure for controlling refrigerating machines and a system for carrying out said procedure.
• the present invention is directed towards a procedure for controlling refrigerating machines and the temperature of the coolant thereof.
• a variety of principles of control are available to the person skilled in the art.
• One way is to adjust the temperature of the coolant in the equalizationtank by controlling the run-time of the compressor.
• Another way is to adjust the outgoing temperature of the coolant by shunting at the equalizationtank, see for example CH 265303, figure 2, or by bypassing the heat-sink, see for example US 5 743 102 A.
• the refrigerated display case is dimensioned for the greatest load of both customers- and goods in accordance to EN441.
• the refrigerated display cases are divided into different temperature classes depending upon the field of application. It has also been defined at which ambient temperature the cooling system is to be used. In Sweden the most common class is IS02 which means that the ambient temperature is +22°C and that the relative humidity is 60%.
• the refrigerating machines are dimensioned to provide the intended cooling effect even during hot summer days. Generally, the refrigerating machine will provide the intended cooling effect at an outdoor temperature of +27°C as well as ensure that high- pressure release at considerably higher temperatures does not occur.
• FIGS 1 and 1A of the present invention schematically illustrate how the present-day, energy preserving, indirect cooling systems are structured.
• the compressors are capacity controlled so that the outgoing temperature of the coolant always is -8°C, independent of the incoming coolant.
• a two-circuit system with a fixed flow between the evaporator and an equalization tank is used.
• a pump P2 ensures this flow.
• the temperature in the refrigerated display cases is controlled by thermostats which open and close the valves V1-V3 respectively according to the requirement of the refrigerated display case.
• a fixed pump P2 can also be used and so-called overflow valves which shunt the flow over the refrigerated display cases. These valves then uphold the pressure drop at a constant level in the machine regardless of the system load.
• Figure 1 discloses a general temperature condition of a known system during normal operation.
• the main object of the present invention is primarily, with simple measures and means, to effectively and safely solve said problem.
• a further object of the present invention is to find a system that can solve the above stated problem.
• a cooling system with a variable flow is connected through a refrigerating unit and that there are means for sensing the output from coolant temperature which is input as well as output to the refrigerating unit and/or output from pumps equipped with speed regulators and pressure sensors arranged within the system, and after mathematical processing of said output by means for carrying out this procedure and using this obtained value as input to the capacity controlling of the present refrigerating unit.
• Figure 1 and figure 1A illustrate known solutions for controlling the cooling system for refrigerated display cases
• FIG. 2 and figure 3 illustrate control systems according to the present invention during normal operation and during night conditions, respectively.
• a pipe 1, for supplying coolant is connected to a present pump 2 arranged to pump coolant through said pipe 1, through the refrigerating unit and where 3 indicates its evaporator.
• a similar system 4 which is arranged to allow a variable flow, comprising means 5 for sensing the temperature difference between the incoming and outgoing coolant, and to use this obtained value as input to the capacity controlling of the present refrigerating machine.
• a pump 2 of said refrigerating machine includes a speed regulator 8 which affects the value of the outgoing temperature of the coolant.
• the refrigerated display cases are in the drawings assigned the numbers 18-20.
• Said pipe 1 supply coolant to and divert coolant away from said refrigerated display cases 18-20.
• One method for controlling refrigerating machines and the temperature of their coolants with a system comprises adjustment of the outgoing temperature of the present refrigerating unit to the real demand for refrigeration, and thereby creating a cooling system 4 that works with a dynamic temperature of the coolant.
• the system 4 is coupled as a one-circuit system with a variable flow rate through the refrigerating unit.
• a simpler system solution provides a simpler and less expensive installation, e.g. the cost for equipment in the store can be reduced by around SEK 100.000.
• Reduced energy loss in the piping system Heavily increased COP.
• Very high energy saving potential. Can be applied to basically all new and already existing systems. Higher food quality through a more even temperature. The risk of freezing of sensitive groceries is eliminated.
• the refrigerating compressor 9 is connected to yet another line circuit 10.
• the numbers 11-13 denote a plurality of control valves within the system 4 and which are connected to the line circuit 1 which in said pump 2 functions, as well as connects, the refrigerated display cases 18-20.
• the numbers 14, 15 denote two pressure sensors while two temperature sensors are denoted by the numbers 16, 17, and which are a part of said line circuit 1.
• the temperature difference between the incoming and the outgoing coolant is used as signal input to the capacity controlling of the refrigerating machine and the speed regulator of the pump 2 thereby affects this said value.
• the flow in the system is set to decrease when, for example the valves 11-13 in system 4 are beginning to close, whereby the pump 2 adjusts its capacity by decreasing its speed.
• the pump 2 adjusts its capacity by decreasing its speed.
• the speed of the compressor can be reduced by said capacity controlling in the refrigerating machine in order to maintain the difference in temperature between the incoming and outgoing coolant and thereby obtain an increase of the outgoing temperature and also an increase of the evaporation temperature.
• a pressure- and temperature sensor 50 in the evaporating circuit 10 can in some cases be used which gives a signal to the system's capacity control.
• a further circuit 25 leads from a condenser 27 to a coolant cooler 26 of, for example a known type, and a pump 6 is connected to said circuit 25.
• a speed regulator 7 is arranged to be able to affect the value of the heat-carrier and said pump 6.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Air Conditioning Control Device (AREA)
• Feedback Control In General (AREA)
• Sorption Type Refrigeration Machines (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Control Of Heat Treatment Processes (AREA)

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

Country Status (8)

Families Citing this family (2)

Family Cites Families (5)

• 2001
  • 2001-05-03 SE SE0101548A patent/SE525964C2/sv not_active IP Right Cessation
• 2002
  • 2002-05-03 AT AT02733654T patent/ATE487103T1/de not_active IP Right Cessation
  • 2002-05-03 PT PT02733654T patent/PT1390677E/pt unknown
  • 2002-05-03 ES ES02733654T patent/ES2355496T3/es not_active Expired - Lifetime
  • 2002-05-03 WO PCT/SE2002/000858 patent/WO2002090851A2/en not_active Ceased
  • 2002-05-03 EP EP02733654A patent/EP1390677B1/de not_active Expired - Lifetime
  • 2002-05-03 DE DE60238185T patent/DE60238185D1/de not_active Expired - Lifetime
  • 2002-05-03 DK DK02733654.4T patent/DK1390677T3/da active

Non-Patent Citations (1)

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